Deep well type pump

ABSTRACT

The motor-pump unit of the invention relates to a self-priming centrifugal pump and electric motor combination wherein the apparatus includes a sealed outer housing means having liquid inlet and a discharge outlet, a pump mounted within the housing means, an electric drive motor positioned within the housing means and including an inner housing for the electric motor. The inner housing is secured to the housing means to form a cooling chamber around the electric motor, and the pump has an outlet connecting to the cooling chamber for circulation of the pumped liquid around the motor housing prior to discharge from the apparatus.

United States Patent 9 Conery et al. [45] Nov. 28, 1972 [54] DEEP WELL TYPE PUNIP 3,289,595 12/1966 Bach ..3lO/54 X [72] Inventors: William Comfy; Donald A KEE5 2,822,758 2/1958 Dove ..4l5/ 106 X of Ashland, Ohlo FOREIGN PATENTS OR APPLICATIONS [73] Assignee Pump Cmlmy, 862 900 3/1941 France ..417/423 Hayesville, Ohio I Filed: Jan. 22, 1971 Primary Examiner-Robert M. Walker 211 Appl. No.: 108,806 Attorney-0mm & Oldham [57] TRACT [52] Cl 2 j gg The motor-pump unit of the invention relates to a self- Int Cl F04, 17/00 F04; 35/00 04b priming centrifugal pump and electric motor combina- F0 1d Hozk 6 tion wherein the apparatus includes a sealed outer 58] Field of Search 417/369 366 housing means having liquid inlet and a discharge out- 106 310/ let, a pump mounted within the housing means, an electric drive motor positioned within the housing 56 means and including an inner housing for the electric 1 References Cited motor. The inner housing is secured to the housing UNITED STATES PATENTS means to form a cooling chamber around the electric motor, and the pump has an outlet connecting to the 11,1961 Graqqvlst "417/366 X cooling chamber for circulation of the pumped liquid 2/1962 Hernck et a1 "417/369 around the motor housing prior to discharge from the 3,l53,382 10/1964 Blarcom, J 1. ..3lO/54 X apparatus 7 2,913,988 11/1959 White..; ..4l7/357 7/1960 Frederick ..415/53 7 Claims, 3 Drawing Figures PATENTEDnuvza m2 INVENTORS WILLIAM J. CONERY ATTORNEYS DONALD A. KAESSEN OLDHAM 8 OLDHAM FIG. 2

DEEP WELL TYPE PUMP The present invention relates to centrifugal pumps adapted for use as self-priming centrifugal pumps or for use with an ejector for'deep or shallow well service.

BACKGROUND OF THE INVENTION The general object of the present invention is to provide a novel and improved pump unit wherein the pumped liquid can be circulated around an inner housing in the apparatus for cooling the stator of the drive motor in the pump.

A further object of the invention is to provide a novel and improved mounting for an impeller in a pump to improve impeller and bearing wear in the pump; and to FIG. Us a vertical section through a motor-pump apparatus or combination embodying the principles of the invention;

FIG. 2 is an end elevation-of the motor-pump apparatus of FIG. 1; and

I FIG. 3 is a fragmentaryenlarged view, primarily in section, of a portion of the motor and pump shaft and associated means. 1

When referring to corresponding members shown i the drawings and referred to in the specification, cor- I responding numerals are used to facilitate comparison therebetween.

' INVENTIVE SUBJECT MATTER The present invention relates to a motor-pump combination or apparatus wherein a sealed housing means is provided and it has a discharge outlet, a pump including a casing is positioned within the housing means, an electric motor within the housing means and connecting to and driving the pump, an inner housing encompassing the electric motor and secured to the housing provide an improved pump having a double volute of the self priming type and discharge means provided in the pump casing, which casing has'one. difuser and discharge opening at the top and one difuser and discharge opening at the bottom of the pump casing which is received within a sealed enclosure for the apparatus of the invention. a

Other objects of the invention are to provide an improved driven pump assembly wherein a motor type not requiring a centrifugal starting switch as a three phase motor, a standard permanently split capacitor type, or a capacitor start motor etc. can be used'and where the stator winding can be cooled by the pumped liquid; to use a stainless steel liner in the air gap of the motor so that the rotor is sealed from the stator; to provide a cooling and lubricating fluid as oil, water or an anti-freeze liquid in the rotor chamber of the. electric motor to prevent the pumped liquid from entering the rotor chamber; to provide a pumpimpeller mounted on the pump shaft by a splined connection so that the impeller is free to move axially in the pump and to be hydraulically balanced on the opposite faces thereof; to provide a cooling compartment in the pump apparatus for passage of the pumped water around a housing for the motor for cooling action thereon; to provide a pump apparatus housing that can be formed from a molded plastic shape; to provide special means for mounting an inner housing for an electric motor on the outer housing or enclosure for the motor-pump com bination of the invention and to enable a clamp ring to be used to secure adjacent flanges on the inner housing and main or outer housing together to position the inner housing on and within the outer housing in the apparatus; to provide a pump which is adapted to have an ejector system connected thereto for deep or shallow well operation; and to provide a motor-pump unit where the entire motor pump assembly can be removed from the housing of the apparatus without disturbing the input or output connections to the housing of the apparatus.

The foregoing and other objects and advantages of the invention will be made more apparent as the specification proceeds.

Reference now is directed to the accompanying drawings, wherein:

means to form a cooling chamber around the electric motor, and where; the pump casing has an outlet connecting to the cooling chamber, which cooling chamber connects to the discharge outlet of the housing means for controlled flow of the pumped liquid through the cooling chamber to cool the electric motor stator.

The motor-pump, or pump 10 of the invention includes'a sealed outer housing or housing means 12 that has a unit formed from an electric motor and a'pump and indicated as a whole by the numeral 14 received within such outer housing. This unit 14 includes an inner housing 16 which has a radially outwardly extending end flange 18 provided on one end thereof and which has a smaller diameter, but substantially continuous end flange 20 provided at the other or inner end thereof. Such inner end flange 20 has a pump casing or housing 22 secured thereto as by cap screws 24 or the like to provide a pump chamber 25. An impeller 26 for the pump of the invention is operatively positioned in the chamber 25 as hereinafter described.

-The drawing shows that a stator 28 of an electric motor 30 is secured to a closed bell-shaped inner end provided on the inner housing 16 adjacent the smaller end flange 20 of the inner housing, as by cap screws 32 or the like. The rotor 34 for the motor is carried on a shaft 36 which protrudes axially from a portion of the inner housing 16 and has the impeller 26 secured thereto, preferably by means of inter-engaging splines 38 formed on an end portion of the shaft 36 and in the bore of a hub 40 for the impeller 26 of the pump. The

shaft 36 is positioned by suitable members, such as PUMP CONSTRUCTION I An inlet 50 is formed in the outer housing 12 and this inlet connects to a corresponding inlet 52 provided in a center portion of one side of the pump impeller 26 whereby water flowing into the pump will flow into the impeller and be forced outwardly of the pump by rotation of the impeller.- This impeller has sealing rings 54 and 56 positioned adjacent opposed faces of the impeller on the outer surface thereof to seal the impeller in the pump casing 22. This casing 22 has twin volutes formed therein and one difuser and one discharge opening are provided at the top of this pump casing and one difuser and discharge opening are provided at the I bottom of the end casing whereby'the pumped liquid will be forced under pressure from the enclosure in which the impeller is received at both the top and bottom portions thereof.-

Preferably the pump impeller has a rib 57 provided on the axially outer face of theimpeller to aid in seating ELECTRIC MOTOR COOLING A feature of the invention resides in the fact that a cooling chamber 60 is formed between the outer housing 12 and the inner housing 16. Water discharged from the pump hence is circulating under pressure in this cooling chamber and it will be noted that the stator of the electric motor is positioned immediately adjacent the inner housing 16 which has the cooling water flowing therearound. A discharge opening 62 is provided in the outer housing 12 spaced axially from the pump casing and any suitable discharge conduit 64 is connected thereto. Usually a pressure regulating valve 66 is provided in this discharge pipe 64 to aid in controlling the operation of the pump unit 10.

It should be realized that the pump of the invention can be used with a jet assembly or nozzle as is well known in the pump art. Thus, a discharge opening 68 is provided in the outer housing 12 adjacent theinlet 50 for connection to either a shallow well jet pump system and/or to a deep well jet pump system, as desired. These connections are of conventional construction and any suitable means can be associated with or used with the pump 10 of the invention to connect to a water source for pumping action.

The shaft 36 and the sealing means provided therefor is better shown in FIG. 3 of the drawings, and thus the shaft may include a face type seal 70 of a suitable conventional construction and wherein such seal is retained against a shoulder 72 provided on the tubular section 42. A rotating seal seat 76 is sealed to the shaft by resilient static seal ring 78, positioned on the shaft by washer 79 and snap ring 80. The seal seat 76 is in sealing contact with spring loaded seal washer 74 to prevent interchange of pumped liquid and motor chamber liquid.

As another feature of the invention, it is desired to provide a cooling and lubricating fluid such as a liquid anti-freeze composition 81 in which the rotor 34 of the motor operates. This anti-freeze liquid 81 is retained in association with the rotor 34 by positioning a stainless steel liner or sleeve 82 in the air gap between the stator 28 and rotor 34 and which sleeve would be secured in sealed relationship to the inner housing 16 at one end of the sleeve as by means of a static seal 84 including an O-ring 84a and an O-ring retainer 84b. The opposite end of the stainless steel liner 82 is suitably secured'to I the end cap 46 provided for the rotor and secured in position in any suitable manner whereby an enclosed chamber is provided for the rotor. The rotor 34 and shaft 36 is supported by the bearings 44 and 47 and positioned axially between them by thrust washers 88 and 90. The axially inner end of the shaft 36 is sealed against discharge by the shafts seal washer 74 and seat 76. Hence any suitable liquid, such as water with alcohol therein or other antifreeze material is provided for encompassing the rotor and aiding in maintaining it operating under low temperature conditions. An expansion chamber 94 is formed in the axially inner end of the inner housing and it extends upwardly from the rotor. A pipe plug 96 engages the inlet bore for the expansion chamber 94 which is only partially filled with liquid to permit volume adjustment automatically with I the liquid received within the sleeve 82, a bore 102 is provided in the shaft 36 at its axially outer end and liquid can flow to and form such bore through bypasses 104 provided in the engagement of the end cap 46 with the bearing 47. A radially directed bore 106 in the shaft connects the bore 102 to the rotor chamber so that liquid flow to and from the bore 102 is facilitated to obtain flow of liquid around the rotor and aid in the cooling and bearing lubrication action obtainedlorts 108 are provided in one or both thrust washers to facilitate this liquid flow.

A cover 110 is suitably secured to the inner housing 16 to enclose the end of the motor 30.

From the foregoing it is believed that a novel and improved pump has been provided by the invention and that the objects of the invention have been achieved.

While one complete embodiment of r the invention has been disclosed herein, it will be appreciated that modification of this particular embodiment of the invention may be resorted to without departing from the scope of the invention as defined in the appended claims. a

What is claimed is: v

l. A motor-pump apparatus comprising a sealed housing means having an inlet opening and a discharge outlet,

a pump unit within said housing means,

an electric motor including a housing positioned within said housing means whereby discharge from said pump unit flows around said housing to cool the same prior to flow out of said discharge outlet, said housing having a radially extending end flange thereon,

said housing means having an edge flange at one end thereof abutting on said end flange,

means securing said flanges together to position said housing on said housing means, and

said pump unit being secured to and carried by said housing.

2. A motor-pump apparatus'as in claim 1 and comprising a pump impeller mounted on a shaft within said pump unit, said impeller having splined engagement with said shaft to float axially, thereon and balance the pressures on opposite sides of said impeller.

3. A motor-pump apparatus as in claim 1 and where said pump includes a casing therefor, said pump casing having a double volute formed therein with one diffuser and discharge opening at the top and one diffuser and discharge opening at the bottom of said casing whereby said pump is self priming.

4. A motor-pump apparatus comprising a sealed housing means having an inlet opening and a discharge outlet, a pump within said housing means,

an electric motor within said housing means and connected to said pump,

an inner housing encompassing said electric motor and secured to said housing means to form a cooling chamber around said electric motor,

said pump having an outlet connecting to said cooling chamber, said cooling chamber connecting to said discharge outlet of said housing means, a stainless steel liner positioned in said inner housing and sealing the motor stator from the motor rotor, means combining with said liner and forming an enclosed rotor chamber, and

a cooling liquid in said rotor chamber.

5. A motor-pump apparatus as in claim 4 where said electric motor includes a shaft adapted for horizontal rotation, and an expansion chamber connects to an end portion of said rotor chamber and extends upwardly therefrom, said rotor chamber being filled with liquid but said expansion chamber normally having a volume of air therein. 5

6. A motor-pump apparatus as in claim 4 and including said electric motor being of the class consisting of a permanent split capacitor motor and a capacitor start motor type, the stator of said motor being cooled by the pumped liquid, and a stainless steel liner in the motor air gap.

v 7. A motor-pump apparatus as in Claim 4 where said electric motor includes a shaft and said shaft has a liquid flow bore means formed therein connecting to spaced portions of the rotor chamber, and an expansion chamber connects to an end portion of said rotor chamber and extends upwardly therefrom, said rotor chamber being filled with liquid. 

1. A motor-pump apparatus comprising a sealed housing means having an inlet opening and a discharge outlet, a pump unit within said housing means, an electric motor including a housing positioned within said housing means whereby discharge from said pump unit flows around said housing to cool the same prior to flow out of said discharge outlet, said housing having a radially extending end flange thereon, said housing means having an edge flange at one end thereof abutting on said end flange, means securing said flanges together to position said housing on said housing means, and said pump unit being secured to and carried by said housing.
 2. A motor-pump apparatus as in claim 1 and comprising a pump impeller mounted on a shaft within said pump unit, said impeller having splined engagement with said shaft to float axially thereon and balance the pressures on opposite sides of said impeller.
 3. A motor-pump apparatus as in claim 1 and where said pump includes a casing therefor, said pump casing having a double volute formed therein with one diffuser and discharge opening at the top and one diffuser and discharge opening at the bottom of said casing whereby said pump is self priming.
 4. A motor-pump apparatus comprising a sealed housing means having an inlet opening and a discharge outlet, a pump within said housing means, an electric motor within said housing means and connected to said pump, an inner housing encompassing said electric motor and secured to said housing means to form a cooling chamber around said electric motor, said pump having an outlet connecting to said cooling chamber, said cooling chamber connecting to said discharge outlet of said housing means, a stainless steel liner positioned in said inner housing and sealing the motor stator from the motor rotor, means combining with said liner and forming an enclosed rotor chamber, and a cooling liquid in said rotor chamber.
 5. A motOr-pump apparatus as in claim 4 where said electric motor includes a shaft adapted for horizontal rotation, and an expansion chamber connects to an end portion of said rotor chamber and extends upwardly therefrom, said rotor chamber being filled with liquid but said expansion chamber normally having a volume of air therein.
 6. A motor-pump apparatus as in claim 4 and including said electric motor being of the class consisting of a permanent split capacitor motor and a capacitor start motor type, the stator of said motor being cooled by the pumped liquid, and a stainless steel liner in the motor air gap.
 7. A motor-pump apparatus as in Claim 4 where said electric motor includes a shaft and said shaft has a liquid flow bore means formed therein connecting to spaced portions of the rotor chamber, and an expansion chamber connects to an end portion of said rotor chamber and extends upwardly therefrom, said rotor chamber being filled with liquid. 